Gearing for knife-sharpeners.



G. J. SEISS. I GEARING FOR KNIFE SHARPE NEBS,

APPLICATION FILED JUNE5, 1912.

1,109,945, Patented Spt.8,1914.

MUTNE'EEEE' GEORGE J. SEISS, or TOLEDO, OHIO.

GEARING FOR KNIFE-SHARPENERS.

Application filed June 5, 1912. Serial No. 701,880.

To all whom it may concern 'Be it known that I, Gnoncn J. Snrss, acitizen of the United States, and a resident of Toledo, in the county ofLucas and State of Ohio, have invented a certain new and,

useful Gearing for Knife-Sharpeners; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and usethe same, reference being had to the accompanying drawings,and to the characters of reference marked thereon, which form a part ofthis specification.

My invention relates to apparatus for the sharpening of knives,scissors, and the like, and has for its object the provision of animproved apparatus of this character which is easy and efficient in itsoperation, simple and inexpensive of manufacture, and adapted for thesharpening of knives, scissor blades, lawn-mower blades, and other formsThe invention is fully described in the following specification, andwhile, in its broader aspect, it is capable of embodiment in numerousforms, a preferred embodiment thereof is illustrated in the accompanyingdrawings,in which" Figure 1 is a perspective view of an apparatusembodying the invention, and Fig.

2 is aninner side view of the master drive gear thereof.

Referrlng to the drawlngs, 1 designates the base of the machine frame;2, 2 bearing standards rising from opposite ends thereof, and 3an-L-shaped arm which extends downwardly from one side of the base andcarries a screw 4 for'clampingthemachine frame to a table edge or othersuitable support.

A shaft 5 is mounted at its opposite ends in the upper end portions ofthe respective standards, 2, 2, and carries an emery or other suitableform of grinding or sharpening disk without the standard 2, and aspur-gear 7 without the other of said standards. A similar shaft 8 isalso mounted at one endin the standard 2' and carries a spur-gear 9 atsuch end in mesh with the spur gear 7 while its other end rests forlateral sliding movements upon a seat 10,

- provided at the upper end of the standard 2, and carries an emery orother suitable form of grinding disk 6 without said standard inperipheral contact with the disk 6.

Specification of Letters Patent.

Patented Sept. 8,1914.

The shaft 8 is retained to the standard seat 10 for yielding slidingmovements thereon toward or away from the shaft 5 by a spring-finger 11,which has its upper end hooked over the shaft 8 at the inner side of thestandard 2 and thence extends downwardly, in inwardly bowed form, arounda tension pin 12, projecting from the standard 2, and has its lower endhooked around the edge of thebase l, or anchored thereto in any othersuitable manner. The grinding disks 6, 6 are preferably of greaterdiameter than the gears 7 and 9 to enable them to be used a considerablelength of time Without replacing on account of wear. The mak ing of thedisks 6 and 6 of greater diameter than the spur-gears causes the shaftsto stand in diverging planes and to gradually move toward each other attheir more remotely spaced ends as the disks wear down in use. p

A crown-toothedgear 13 is employed to drive one of the gears 7, 9, itbeing mounted, in the present instance, on a stud 14 projecting from anedge of the standard 2' and having its teeth in loose mesh with the gear9, the edge of which projects from the adjacentedge of the standard 2for such purpose. The crown-teeth 15 of the gear 13 are peculiarlyarranged on the face of the gear, each being disposed in planes whichare tangential to an imaginary circle intermediatethe gear periphery andaxis, such circle having its radius preferably about two-thirds of thelength of the gearradius.

In order to adapt the teeth of the gears 7 and .9 to mesh properly witheach other when their shafts are disposed in diverging planes and toenable the teeth ofone ofthe gears to mesh with the teeth 15 of thedrive,

the spur gear teeth are twisted slightly so that their end edges areinclined relative to their axes instead of being in parallelism ing ifpermitted would tend to cause a,

drawing of the article being sharpened down between grinding members,which feature is quite objectionable in rotary sharpeners of this class.The back turning of the drive gear is prevented by reason of the innerends of its teeth 15 striking against the sides of the spur teeth, thuslocking the parts against back" turning. The gear 18 is provided with acrank-handle 16 for turning.

When sharpening knives or similar articles it is preferable to place theedge to be sharpened downward in the space between the two grindingdisks, the article being guided in such movement by a pair of spacedguide-pins 17 rising from the inner end portion of the standard seat 10in proper position for such purpose.

In order to adapt the apparatus for the sharpening of blades the cuttingedges of which are angled, as in the case of the blades 19 rises fromthe upper end of the standard 2 adjacent to the base of the boss 19 tocooperate therewith in guiding the movements of a blade when beingsharpened.

It is found in practice that my improved sharpening apparatusisadmirably adapted for household use in the sharpening of knives,scissors and the like, and its cheapness and durability of constructionenables it to be-produced and sold at a small cost to the user.

I wish it understood that my invention is.

not limited to any specific construction or arrangement of the partsexcept in so far as such limitations are specified in the claims.

Copies of this patent may be obtained for five cents Having thusdescribed my invention, what I claim as new and desire to secure byLetters Patent, is-

1. In combination, a driven gear, a drive gear mounted with its axisdisposed substantially at right angles to and below the axis of thedriven gear and having crown teeth in loose mesh with the teeth of thedrlven gear and disposed in tangentlal relat1ont0 the circumference of acircle intermediatethe axis and perlphery of the drive gear and of alength sufficient to engage advance contiguous drlven gear teeth whendriving in one direction but disposed relative to the driven gear toabut the contiguous driven gear teeth at the ends of the teeth of thedrive gear when the motion is reversed.

2. In combmation, a pair of driven spur gears, a shaft for supportingeach of said spur gears, the shaft of one of the said spur gears beingmovable at one end with respect to the shaft of the other spur gear, aspring for normally pressing the said movable shaft toward the shaft ofthe other spur gear, a

drive gear mounted with its axis disposed at substantially a right angleand below the axes of the spur gears and having crown teeth 1n loosemesh with the teeth of the spur gear having the movable shaft anddisposed in tangential relation to the circumference of a circleintermediate the axis 1 and periphery of the drive gear and of a lengthsuflicient to engage advance contiguous driven spur gear teeth whendriving in one direction but disposed relative to the spur gear to abutthe contiguous spur gear teeth at the ends of the drive gear when themotion is reversed.

In testimony whereof, I have hereunto signed my name to. thisspecification in the presence of two subscribing witnesses.

GEORGE J; SEISS.

Witnesses 0. WV. OWEN, V E. E. THOMAS.

each. by addressing the Commissioner of Patents.

Washington, D. 6.?

